{"id":"CVE-2026-57860","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-57860","summary":"ForgeCode Arbitrary Code Execution via Unvetted .mcp.json in Untrusted Repository","details":"ForgeCode (tailcallhq/forgecode), an AI pair-programming CLI, automatically loads and executes the MCP servers defined in a repository's .mcp.json file on startup without user confirmation. A malicious repository can supply a crafted .mcp.json whose mcpServers entries specify arbitrary command and args values (for example, command: bash with args: ['-c', 'touch /tmp/pwned']). When a user runs the forge CLI inside a cloned untrusted repository, the specified commands are spawned with the invoking user's privileges, resulting in arbitrary code execution. This provides a reliable initial-access and persistence primitive against developers who evaluate untrusted repositories with ForgeCode.","published":"2026-07-17T16:16:09.573Z","modified":"2026-08-12T03:51:31.252214349Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[],"fix":{"url":"https://github.com/tailcallhq/forgecode/commit/68ca3a3a26c73c38a700453d3d021b5bbdc15dbd","label":"tailcallhq/forgecode@68ca3a3"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/57xxx/CVE-2026-57860.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-57860"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/forgecode-arbitrary-code-execution-via-unvetted-mcp-json-in-untrusted-repository"},{"type":"REPORT","url":"https://github.com/tailcallhq/forgecode/issues/3022"},{"type":"REPORT","url":"https://github.com/tailcallhq/forgecode/issues/3252"},{"type":"FIX","url":"https://github.com/tailcallhq/forgecode/commit/68ca3a3a26c73c38a700453d3d021b5bbdc15dbd"},{"type":"PACKAGE","url":"https://github.com/tailcallhq/forgecode"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:31.252214349Z"}}